In a medium sauté pan, heat oil over medium-high heat until it shimmers. Add eggplant, zucchini, bell peppers, and shallot. Reduce heat to medium; cook, stirring frequently, until vegetables begin to soften. Add tomatoes, ¼ cup water, basil, parsley, vinegar, thyme, garlic, salt, and pepper. Reduce heat to medium-low heat; cover and cook, stirring occasionally, until vegetables are softened and tender. Let cool completely.
Notes
MAKE-AHEAD TIP: Ratatouille can be made a day in advance and stored in an airtight container in the refrigerator. Let come to room temperature before using.
Recipe by TeaTime Magazine at https://teatimemagazine.com/ratatouille-quiches/